LLMs like ChatGPT are not intelligent. They're just regurgitating information, making them susceptible to spreading misinformation like a fake moonlanding. (lemmy.ml)
TL;DR: LLMs are just mimicking natural language and conversation. Fact checking and healthy skepticism is not part of their model. For example they can be easily tricked into advocating conspiracy theories, like a fake moon landing. Google Bard is even stating arithmetic falsehoods like 5*6 != 30